US4616107A - Pattern input apparatus - Google Patents

Pattern input apparatus Download PDF

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Publication number
US4616107A
US4616107A US06/705,550 US70555085A US4616107A US 4616107 A US4616107 A US 4616107A US 70555085 A US70555085 A US 70555085A US 4616107 A US4616107 A US 4616107A
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US
United States
Prior art keywords
conductors
signal
pen
potential
tablet
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/705,550
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English (en)
Inventor
Kiyomi Abe
Mitsuo Kazama
Hiroshi Kobayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentel Co Ltd
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Pentel Co Ltd
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Assigned to PENTEL KABUSHIKI KAISHA, D.B.A. PENTAL CO., LTD. reassignment PENTEL KABUSHIKI KAISHA, D.B.A. PENTAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ABE, KIYOMI, KAZAMA, MITSUO, KOBAYASHI, HIROSHI
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0441—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the present invention relates to a pattern input apparatus, and particularly to a pattern input apparatus in which an input pen is caused to come in contact with an upper face of a tablet provided with a matrix of groups of conductors disposed at intervals along coordinate axes so as to input hand writing information into an electronic computer system, or the like.
  • a tablet having a grid of parallel conductors disposed along coordinate axes at regular intervals is disclosed, for example, in U.S. Pat. Nos. 3,567,859, and 3,732,369.
  • conductors belonging to one group are successively electrically actuated one after one with a pulse signal and then conductors in the other group are successively electrically actuated one after one with a pulse signal.
  • An input pen having an electrically conductive tip end is made to come into contact with the face of such a tablet to make capacitive coupling with a pair of adjacent conductors.
  • Signals obtained by the input pen from the conductors successively actuated with pulses is used to digitalize the coordinates of the position of the pen on the surface of the tablet.
  • the position digitalizing operation is performed such that the position of input the pen is digitalized along one coordinate axis and then digitalized along the other coordinate axis.
  • FIG. 1 shows electrical potential levels on the conductors arranged on the tablet in the direction X.
  • Characters L 0 , L 1 , and L 2 designate the respective potential levels when a voltage is applied to conductors X 0 , X 1 , and X 2 arranged at a distance W in the direction X.
  • the potential level is approximately proportional to the distance.
  • the distance x can be obtained by performing calculation in accordance with the following expression: ##EQU1## where d designates the highest potential level, b the second highest potential level, and c an offset value to be set for compensating for a change in potential level depending on the thickness, the quality, the number of sheets of paper disposed on the tablet.
  • d designates the highest potential level
  • b the second highest potential level
  • c an offset value to be set for compensating for a change in potential level depending on the thickness, the quality, the number of sheets of paper disposed on the tablet.
  • An object of the present invention is to provide a pattern input apparatus in which the position of an input pen can be accurately detected at a high speed without affected by the condition of paper, or the like, mounted on a tablet.
  • Another object of the present invention is to provide a pattern input apparatus which has a simple arrangement and in which sufficiently high speed input can be attained even in the case where a general purpose microcomputer is employed.
  • a pattern input apparatus comprising: a tablet having a matrix composed of two sets of conductors disposed at intervals along coordinate axes; a pair of scanning means for successively supplying the conductors of the respective sets with scanning pulses; an input pen for detecting application of the scanning pulse on adjacent ones of the conductors when the input pen is positioned on the tablet, thereby producing position signals; a selecting circuit for selecting at least three ones of the position signals respectively having higher electric potentials; and an operation circuit for determining the position of the input pen in such a manner that one of the three selected position signals having the highest level is regarded as a reference signal and subtractions are performed between the reference signal and each of the remainder ones of the three selected position signals to obtain two potential differences, whereby the position of the input pen is determined from the ratio between the two potential differences.
  • the invention employs such a system that the signals and the potentials of the conductor to which the input pen is most adjacently positioned and two conductors positioned at both sides of the first-mentioned conductor ajdacently thereto, the signal having the highest potential among these three signals is regarded as a reference signal, two potential differences are obtained by performing subtractions between the reference signal and each of the two remainder signals, and position of the input pen is determined by the ratio between the two potential differences. Accordingly, the error due to the influence of the above-mentioned offset value can be completely eliminated, the operation circuit may be constituted by a general purpose computer because of simplicity of calculations, and sufficiently high speed input can be obtained.
  • FIG. 1 is a digram showing the state of distribution of potentials, for explaining the principle of the conventional position detecting method
  • FIG. 2 is a diagram showing the state of distribution of potentials, for explaining the principle of the position detection according to the present invention
  • FIG. 3 is an explanatory diagram showing a main part of FIG. 2;
  • FIG. 4 is an electrical block diagram showing an embodiment of the present invention.
  • FIG. 5 is a diagram for explaining the potential levels detected from the respective conductors in FIG. 4.
  • FIG. 6 is a flowchart for explaining the operation of the whole of FIG. 4 embodiment.
  • FIG. 2 shows the state of potential distribution similarly to that shown in FIG. 1, in which the conductors are parallelly disposed at a regular interval P.
  • a triangle lmn formed by connecting the intersection point l between the respective potential levels of the conductors X 0 and X 1 , the peak point m of the potential level of the conductor X 1 , and the intersection point n between the respective potential levels of the conductors X 0 and X 2 , and another triangle lDB formed by connecting the potential level point D of the conductor X 1 at the point Tl with which the input pen is in contact, the potential level point B of the conductor X 0 , and the above-mentioned point l.
  • the potential difference obtained by subtracting the potential level b at the potential level point B from the potential level d at the potential level point D is designated by the reference character e.
  • the potential difference f between the points m and n has a value obtained by subtracting the potential level a at the potential level point A of the conductor X 2 at the point Tl with which the input pen is in contact from the potential level d, because the potential distributions of the respective conductors are the same with each other. Accordingly, the following relation can be obtained from the geometrical relation between the abovementioned triangles lmn and lDB. ##EQU2## Similarly to this the following relation can be obtained if attention is made on the triangles l'mn and l'DA. ##EQU3## The position x with which the input pen is in contact is finally obtained by the following expression. ##EQU4##
  • the position of the input pen can be obtained in the same manner as above even if at any position the input pen exists because the potential distribution is a repeated one.
  • description has been made above as to the X-axis direction the same applies to the Y-axis direction, so that the contacting position of the input pen can be determined independently of the above-mentioned offset value c.
  • FIG. 4 shows a tablet having a set of a plurality of conductors X 0 , X 1 -X n , X S , and X E each parallelly extending in the Y-direction and separated one from another by predetermined interval in the X-direction, and another set of a plurality of conductors Y 0 , Y 1 -Y n , Y S , and Y E each parallelly extending in the X-direction and separated one from another by a predetermined interval in the Y-direction. Since such a tablet is known from the above-mentioned U.S. Pat. Nos. 3,567,859 and 3,732,369, detailed description is omitted thereabout.
  • the reference numeral 11A in the tablet 11 designates an effective area where signal detection can be made on the tablet.
  • the two sets of conductors X 0 , X 1 -X n , X S , X E and Y 0 , Y 1 -Y n , Y S , Y E are connected to the respective output terminals of scanning devices 12 and 13 from which scanning pulses are supplied successively to the conductors.
  • An ON-OFF switch 15 actuated in response to the contact of an input pen 14 with the tablet 11 is incorporated in the input pen 14.
  • the ON-OFF switch 15 is connected to one input of an input/output port 16.
  • An output bus 17 of the input/output port 15 is connected to a microcommputer 18 and a memory 19 so that an output signal from the ON-OFF switch 15 is applied to the microcomputer 18 through the input/output port 16.
  • An output bus 21 of the microcomputer 18 is connected to the respective input terminals of the scanning devices 12 and 13 through a gate circuit 22.
  • the microcomputer 18 supplies a scanning pulse to the scanning device 12 or 13 in response to the output signal from the ON-OFF switch 15, and counts the scanning pulse.
  • the gate circuit 22 acts to change over the application of the pulse from the microcomputer 18 between the scanning devices 12 and 13. In response to the pulse from the gate circuit 22, the scanning device 12 or 13 supplies a scanning pulse successively to the conductors one after one.
  • the input pen 14 detects the existence of the scanning pulse through capacitive coupling with the tablet 11 and the output of the input pen 14 is connected to one input terminal of a comparator 24 through an amplifier 23.
  • a variable resistor 25 is connected at its output to the other input terminal of the comparator 24 so as to apply a slice voltage of a predetermined level thereto.
  • the output of the comparator 24 is connected to an interruption terminal of the microcomputer 18 so that when a signal having a level larger than the predetermined slice level is received the comparator 24 produces the received signal to the microcomputer 18.
  • the slice level is preset such that signals can be detected from at least three conductors in the vicinity of the contacting point of the input pen 14.
  • the microcomputer 18 stops the application of the scanning pulse to the gate circuit 22 and steps the pulse counting operation.
  • the output of the amplifier 23 is connected to a sampling/holding circuit 26 which temporarily stores the output signal from the amplifier 23 so as to assure the time taken for performing analog-to-digital conversion of the output signal.
  • the output of the sampling/holding circuit 26 is connected to an analog-to-digital converter 27 in which the output signal of the amplifier 23 is digitalized.
  • the output of the analog-to-digital converter 27 is connected to the other input terminal of the input/output port 16 so that the output of the analog-to-digital converter 27 is stored in the memory 19 as a potential level through the input/output port 16.
  • the microcomputer 18 acts as a control circuit as well as a calculation circuit for controlling and managing the memory 19, the input/output port 16, etc., and may be constituted, for example, by a microcomputer of Z80 type produced by ZILOG in U.S.A. and available on the market. As the input/output port 16, No. 8255 produced by INTEL in U.S.A. may be used. It is a matter of course that the microcomputer 18 and the input/output port 16 are not restricted to the above-mentioned products.
  • the microcomputer 18 After having caused the memory 19 to store the signals detected by the input pen 14, the microcomputer 18 starts the counting operation again. At this time, the counting is initiated from the count which is incremented by one from the count when the counting has been stopped last. Thus, when the signal detected from the input pen 14 is passed through the microcomputer 18 again, the microcomputer 18 stops the counting again as described above and compares the potential level at this time with the potential level previously stored. Repeating the similar operations thereafter, the potential distribution in the vicinity of the contacting point of the input pen is detected.
  • FIG. 5 shows the potential levels detected from the respective conductors when the input pen 14 is in contact with the point Tl.
  • the reference characters b, d, and a designate the potentials detected from the conductors X 0 , X 1 , and X 2 . That is, upon recognizing the decrease in potential level in the above-mentioned repeating operations, the microcomputer 18 detects the potential levels b, d, and a of the respective conductors X 1 nearest to the contacting point of the input pen 14 and X 0 and X 2 adjacent to the conductor X 1 , respectively.
  • the judgement as to whether the contacting position of the input pen 14 is on the right side or on the left side of the adjacent conductor X 1 is performed by the microcomputer 18 through comparison between the potential levels b and a. Based on the result, the contacting position of the input pen 14 is determined in accordance with the above-mentioned expression (3 ). As to the Y-direction, the contacting position of the input pen 14 is obtained quite in the same manner as above. After the contacting position of the input pen 14 has been determined in the X- and Y-directions, the microcomputer 19 transfers this positional information to an output device such as a cathode ray tube (CRT) (not shown), or the like.
  • CTR cathode ray tube
  • the microcomputer 18 When the input pen 14 is in contact with the tablet 11, the microcomputer 18 is actuated in response to the signal from the ON-OFF switch 15 to supply the scanning device 12 or 13 with a scanning pulse through the gate circuit 22 and, at the same time, begin to count up the number of the applied scanning pulses (step 100). This counting-up is continued until the first signal from the tablet 11 is detected (steps 102 and 104). Upon detection the first signal, the microcomputer 18 transfers the potential level of the signal at this time to the memory 19 so that this potential level is stored in the memory 19 (step 106). After the potential level has been stored, the counting-up operation is performed again (step 108).
  • the microcomputer 18 Upon detecting the next signal by the input pen 14, the microcomputer 18 transfers the potential level at this time to the memory 19 in the same manner as the step 106 so as to cause the memory 19 to store this second potential level (step 110).
  • the second potential level is compared with the first potential level (step 112) and when the former is lower than the latter the counting-up operation is performed again (steps 114 and 108).
  • the counting-up, potential detecting, and comparing operations are repeatedly performed until the reduction in potential level is detected, as described above (steps 108, 110, and 112).
  • the repetition operation is ended (step 114).
  • the highest signal level d detected in this repetition operation, the count value X 1 at this time, the signal level b detected before the highest signal level is detected, and the signal level a detected after the highest signal level is detected are stored at predetermined addresses (step 116).
  • the stored signal levels b and a are compared with each other (step 118) so as to judge at which side, right or left, of the conductor X 1 adjacent to the input pen 14, the input pen 14 is in contact.
  • predetermined calculations are performed in accordance with the expression in the step 120 when the signal level b is larger than the signal level a, while in accordance with the expression in the step 122 when the former is smaller than the latter, thereby determining the contacting position of the input pen 14.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
US06/705,550 1984-02-29 1985-02-26 Pattern input apparatus Expired - Lifetime US4616107A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59037679A JPS60181816A (ja) 1984-02-29 1984-02-29 図形入力装置
JP59-37679 1984-02-29

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US4616107A true US4616107A (en) 1986-10-07

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US06/705,550 Expired - Lifetime US4616107A (en) 1984-02-29 1985-02-26 Pattern input apparatus

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US (1) US4616107A (enrdf_load_stackoverflow)
JP (1) JPS60181816A (enrdf_load_stackoverflow)
DE (1) DE3507110A1 (enrdf_load_stackoverflow)
FR (1) FR2560408B1 (enrdf_load_stackoverflow)
GB (1) GB2155641B (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758690A (en) * 1986-07-12 1988-07-19 Alps Electric Co., Ltd. Coordinate detecting method
US4817024A (en) * 1984-03-02 1989-03-28 Hoya Corporation Spectacle-frame shape data producing method
US4996393A (en) * 1990-04-03 1991-02-26 Summagraphics Corporation Digitizer tablet with split-current conductor array
US5194699A (en) * 1990-04-03 1993-03-16 Summagraphics Corporation Digitizer tablet with fixed incremented grid portions
GB2288241A (en) * 1994-03-31 1995-10-11 Graphtec Kk Digitizer and position determination method therefor
US5491706A (en) * 1993-04-07 1996-02-13 Sharp Kabushiki Kaisha Display-integrated type tablet device capable of detecting correct coordinates at a tip end of a detection pen by detecting external noise
US5648642A (en) * 1992-06-08 1997-07-15 Synaptics, Incorporated Object position detector
US5767458A (en) * 1995-02-21 1998-06-16 U.S. Philips Corporation Low-pass filter of graphical tablet has cut-off frequency lower than sampling frequecy
US5854625A (en) * 1996-11-06 1998-12-29 Synaptics, Incorporated Force sensing touchpad
US5861583A (en) * 1992-06-08 1999-01-19 Synaptics, Incorporated Object position detector
US5880411A (en) * 1992-06-08 1999-03-09 Synaptics, Incorporated Object position detector with edge motion feature and gesture recognition
US5889236A (en) * 1992-06-08 1999-03-30 Synaptics Incorporated Pressure sensitive scrollbar feature
US6028271A (en) * 1992-06-08 2000-02-22 Synaptics, Inc. Object position detector with edge motion feature and gesture recognition
US6239389B1 (en) 1992-06-08 2001-05-29 Synaptics, Inc. Object position detection system and method
US6380929B1 (en) 1996-09-20 2002-04-30 Synaptics, Incorporated Pen drawing computer input device
US20100283752A1 (en) * 2009-05-07 2010-11-11 Panasonic Corporation Capacitive touch panel and method for detecting touched input position on the same
US8050876B2 (en) 2005-07-18 2011-11-01 Analog Devices, Inc. Automatic environmental compensation of capacitance based proximity sensors
US20140002409A1 (en) * 2012-06-29 2014-01-02 Cypress Semiconductor Corporation Methods and apparatus to determine position of an input object
US9141229B2 (en) 2011-02-18 2015-09-22 Mitsubishi Electric Corporation Coordinate input device and touch panel device
US9207810B1 (en) * 2011-11-15 2015-12-08 Amazon Technologies, Inc. Fiber-optic touch sensor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2191859B (en) * 1986-05-16 1990-10-10 Qubit Int Sa Navigation aids
JPS6375918A (ja) * 1986-09-19 1988-04-06 Alps Electric Co Ltd 座標入力装置
JPH05233147A (ja) * 1992-02-21 1993-09-10 Mitsubishi Electric Corp ディスプレイ一体型タブレット
TWI430156B (zh) * 2008-09-09 2014-03-11 Alps Electric Co Ltd Coordinate input device

Citations (2)

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US4507523A (en) * 1982-05-19 1985-03-26 Matsushita Electric Industrial Co., Ltd. Position determination apparatus
US4554409A (en) * 1982-10-28 1985-11-19 Photoron Incorporated Method of electromagnetically reading coordinate data

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US3732369A (en) * 1971-04-05 1973-05-08 Welland Investment Trust Coordinate digitizer system
JPS5319380B2 (enrdf_load_stackoverflow) * 1972-11-20 1978-06-20
US4039747A (en) * 1976-02-05 1977-08-02 Telautograph Corporation Apparatus for converting the position of a manually operated instrument into an electrical signal
JPS5935069B2 (ja) * 1979-01-19 1984-08-27 セイコーインスツルメンツ株式会社 座標読取装置の補間方式
JPS5920156B2 (ja) * 1980-07-10 1984-05-11 セイコーインスツルメンツ株式会社 座標読取装置
JPS5884339A (ja) * 1981-11-14 1983-05-20 Pentel Kk タブレツト入力装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4507523A (en) * 1982-05-19 1985-03-26 Matsushita Electric Industrial Co., Ltd. Position determination apparatus
US4554409A (en) * 1982-10-28 1985-11-19 Photoron Incorporated Method of electromagnetically reading coordinate data

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817024A (en) * 1984-03-02 1989-03-28 Hoya Corporation Spectacle-frame shape data producing method
US4758690A (en) * 1986-07-12 1988-07-19 Alps Electric Co., Ltd. Coordinate detecting method
US4996393A (en) * 1990-04-03 1991-02-26 Summagraphics Corporation Digitizer tablet with split-current conductor array
US5194699A (en) * 1990-04-03 1993-03-16 Summagraphics Corporation Digitizer tablet with fixed incremented grid portions
US6750852B2 (en) 1992-06-08 2004-06-15 Synaptics, Inc. Object position detector with edge motion feature and gesture recognition
US20040178997A1 (en) * 1992-06-08 2004-09-16 Synaptics, Inc., A California Corporation Object position detector with edge motion feature and gesture recognition
US5648642A (en) * 1992-06-08 1997-07-15 Synaptics, Incorporated Object position detector
US6610936B2 (en) 1992-06-08 2003-08-26 Synaptics, Inc. Object position detector with edge motion feature and gesture recognition
US6414671B1 (en) 1992-06-08 2002-07-02 Synaptics Incorporated Object position detector with edge motion feature and gesture recognition
US6380931B1 (en) 1992-06-08 2002-04-30 Synaptics Incorporated Object position detector with edge motion feature and gesture recognition
US5841078A (en) * 1992-06-08 1998-11-24 Synaptics, Inc. Object position detector
US7109978B2 (en) 1992-06-08 2006-09-19 Synaptics, Inc. Object position detector with edge motion feature and gesture recognition
US5861583A (en) * 1992-06-08 1999-01-19 Synaptics, Incorporated Object position detector
US5880411A (en) * 1992-06-08 1999-03-09 Synaptics, Incorporated Object position detector with edge motion feature and gesture recognition
US5889236A (en) * 1992-06-08 1999-03-30 Synaptics Incorporated Pressure sensitive scrollbar feature
US6028271A (en) * 1992-06-08 2000-02-22 Synaptics, Inc. Object position detector with edge motion feature and gesture recognition
US6239389B1 (en) 1992-06-08 2001-05-29 Synaptics, Inc. Object position detection system and method
US5491706A (en) * 1993-04-07 1996-02-13 Sharp Kabushiki Kaisha Display-integrated type tablet device capable of detecting correct coordinates at a tip end of a detection pen by detecting external noise
GB2288241B (en) * 1994-03-31 1998-02-25 Graphtec Kk Digitizer and position determination method therefor
US5670754A (en) * 1994-03-31 1997-09-23 Graphtec Corp. Digitizer and position determination method therefor
GB2288241A (en) * 1994-03-31 1995-10-11 Graphtec Kk Digitizer and position determination method therefor
US5767458A (en) * 1995-02-21 1998-06-16 U.S. Philips Corporation Low-pass filter of graphical tablet has cut-off frequency lower than sampling frequecy
US6380929B1 (en) 1996-09-20 2002-04-30 Synaptics, Incorporated Pen drawing computer input device
US5854625A (en) * 1996-11-06 1998-12-29 Synaptics, Incorporated Force sensing touchpad
US8050876B2 (en) 2005-07-18 2011-11-01 Analog Devices, Inc. Automatic environmental compensation of capacitance based proximity sensors
US20100283752A1 (en) * 2009-05-07 2010-11-11 Panasonic Corporation Capacitive touch panel and method for detecting touched input position on the same
US9141229B2 (en) 2011-02-18 2015-09-22 Mitsubishi Electric Corporation Coordinate input device and touch panel device
US9207810B1 (en) * 2011-11-15 2015-12-08 Amazon Technologies, Inc. Fiber-optic touch sensor
US20140002409A1 (en) * 2012-06-29 2014-01-02 Cypress Semiconductor Corporation Methods and apparatus to determine position of an input object
US9001074B2 (en) * 2012-06-29 2015-04-07 Cypress Semiconductor Corporation Methods and apparatus to determine position of an input object

Also Published As

Publication number Publication date
JPS60181816A (ja) 1985-09-17
FR2560408B1 (fr) 1990-12-28
GB8505142D0 (en) 1985-04-03
FR2560408A1 (fr) 1985-08-30
GB2155641A (en) 1985-09-25
DE3507110C2 (enrdf_load_stackoverflow) 1988-12-29
DE3507110A1 (de) 1985-09-05
GB2155641B (en) 1987-08-12
JPH0434778B2 (enrdf_load_stackoverflow) 1992-06-09

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